Target API 30; Added recording widget; Bugfixes

• Updated target API to 30.
• Added public storage not available warning.
• Added Widget which allows start recording instantly without launch app.
• Renamed "Download" feature to "Save as..." to remove misunderstanding.
• Fixed check has available space app crash.
• Fixed notifications progress update app crash.
• Fixed a bug when record decoding didn't start after stop recording from the notification.
• Fixed a bug related to incorrect recording stop after the app restarted during recording.
• Fixed some delete record button errors.
• Fix keyboard show/hide on some devices.
• Multiselect download fixed.
• Minor bug fixes.